γ線照射ならびに圧延をうけたポリエチレンの降伏応力に及ぼす引張速度の影響について

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  • Effect of Rate of Tension on the Yield Point on Rolled and Irradiated Polyethylene
  • ガンマセン ショウシャ ナラビニ アツエン オ ウケタ ポリエチレン ノ コウフク オウリョク ニ オヨボス ヒッパリ ソクド ノ エイキョウ ニ ツイテ

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Specimens applied to tests were made of the Ziegler type polyethylene rolled and/or irradiated with gamma-ray from cobalt 60 under immersion in water and then were heat-treated in boiling water for one hour to stabilize the polyethylene materials. An Instron tester was employed to measure the yield points of all specimens at the cross-head speeds of 0.5, 3.0 and 20 cm/min at a temperature of 30°C. Concluding remarks are as follows : the yield point of polyethylene increases with increasing cross-hear speed, but the yield point ratio (which is defined as the ratio of yield point of irradiated polyethylene to the yield point of non-irradiated polyethylene) becomes smaller when tensile test is performed at higher speed than it is done at lower speed.

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